Enhanced torsional fatigue performance of SAE 8660 steel via modified austempering: role of bainite-martensite microstructure
High-performance transmission components such as shafts and axles are frequently subjected to cyclic torsional loading, where fatigue resistance is critical for service reliability. In this study, a modified austempering process was developed to produce a bainite-martensite mixed microstructure in SAE 8660 steel for en...